If the program does run and produce normal output, the message might be due to an incorrect interpretation of its status/return code1.  Maybe some variation of the issue discussed in What error is "No Error", where the problem seems to have been a negative return code of the program in question.  What return code do you get when you run the same command interactively from the command line?

___

1  this is the respective snippet from Perl's win32.c where the warning (presumably) originates from: 

if (status < 0) {
    if (ckWARN(WARN_EXEC))
        Perl_warner(aTHX_ packWARN(WARN_EXEC), "Can't spawn \"%s\": %s
+", argv[0], strerror(errno));
    status = 255 * 256;
}

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In reply to Re: Can't spawn "cmd.exe": by almut
in thread Can't spawn "cmd.exe": by emalossi

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